Lever-jack



Jfo. JOYCE.

(No Model.)

LEVER JACK.

Patented Feb. 6,1883.

. vation.

UNITED STATES PATENT OFFICE.

JACOB 0. JOYCE, or DAYTON, OHIO.

LEVER-JACK.

SPECIFICATION forming part 'of Letters Patent No. 271,864, dated February 6, 1883.

- Application filed October-23,1882. (N0 model.)

To all whom it may concern:

Be it known that I, JACOB O. J OYGE, a citizen of the United States, and 'a resident of Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvementsin Lever-Jacks, of which thefollowing is a specification.

My invention relates to improvements in lever-jacks.

The first part of my invention relates to pulling-jacks for lifting or suspending weights. The object of this part of the invention is to provide a cheap, convenient tool which will take the'place of the differential pulley in lifting and moving weights in manufactories, distilleries, warehouses, 850. The second feature ofmy invention relates toa many-toothed pawl for holding the load, all of which will be fully set forth in the description of the accompanying drawings, in which- Figure 1 is a longitudinal central section, showing my improvement. Fig.2 is a frontele- Fig. 3 is a detailed view of the link for holding the' pawl, and Fig. 4 an elevation of the lower end of the lifting-bar.

A is the frame of the jack. It is provided with a loop or ear, B, at its upper end, through which is pierced an eye-hole, I), through which a hook or rope is passed to suspend the jack. The lower end of frame A, instead of being provided with an ordinary base, is cut off a short distance below theliftin'g-lever, to allow the rack-bar O to project a sufficient distance below the'frame to allow weights to be attached thereto.

' 0 represents thelifting or rack bar, the lower end of which is provided with an eye, 0, to re ceive a hook or other fastening device.

jack. In my patent of September 15,1874, No.

154,989, I show a pawl 01 many teeth and working in'an inclined seat formed in the frame of the jack. In order to make the pawl sensitive and move at a low angle, I have designed the link form of support here shown.

9 represents a pivot at the lower end of the link G, which hinges the link to the frame'A, the lower end of which link shonld be sulficientl y far from the bar 0 so that the pawl will by gravity readily swing toward the bar 0. A spring may be employed, if'desired, to assist in the movement of the link; but it will not be found necessary; Link G is attached to the pawl preferably by short stud-pins t i, cast in the edges of pawl F, which journal in the-eyes a a, made in the angle of the arms y. The link thus made straddles and supports the pawl on either side, and allows the many-toothed pawl to move out and in to engage with. the teeth of bar 0, or to be released therefrom, it being essential in the operation ofa many-toothed pawl to have its face vertical and to work automatically by the raising of the bar. This method of employing a many-toothed holding pawl is a feature of my invention herein, and it may be applied to any other form of lifting-jacks.

In operation, the frame A is suspended over the weight to be lifted, and the weight attached to the eye 0 in the rack-bar O. The lever D is operated to raise the bar and weight. frame of the jack may be suspended upon a traveling truck running onasill above the floor of the warehouse,,so that thejack and weight may be moved from place to place while the weight is suspended; or .the jack may be attached to a permanent overhanging support of any kind, as desired.

I claim-- 1. A pulling-jack consisting of the frame and suspensionear B, rack-bar O, projecting below the frame A, and having a connectingeye, a, or its described equivalents, and liftinglever and holding-pawl, substantially as herein set forth.

2. In combination with the frame and rackbar of a lever-jack, the many toothed pawl pivoted to the irame by means of the link G and engaging with the rack-bar, substantially as herein set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing wit- The. 

